首页> 外文会议>Center for Chemical Process Safety Annual International Conference; 20040629-0701; Orlando,FL(US) >Extended Indoor Explosion Model with Vertical Concentration Profiles and Variable Ventilation Rates
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Extended Indoor Explosion Model with Vertical Concentration Profiles and Variable Ventilation Rates

机译:具有垂直浓度分布和可变通风率的扩展室内爆炸模型

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For indoor processes that make use of volatile, flammable solvents there is a concern about possible explosions from accidental solvent spills. We previously developed a model that predicts the time-dependent average concentration from a solvent spill accounting for an adjustable room ventilation rate and fresh air makeup ratio. The current paper reports extending the indoor spill model to treat vertical concentration profiles and partial volume deflagration overpressures. Vertical concentration profiles occur in a lower, stratified zone for heavy vapors; a well-mixed zone occurs above that, and a lean, or fuel-free zone above that. With this extension, a flammable concentration can be found in the stratified zone even when the average concentration in the room is below flammable limits. Ignition of stratified vapors gives rise to partial volume deflagrations. A simple approach is described to predict the overpressure developed by a partial volume deflagration before explosion vents open. The predicted explosion overpressures can be plotted against time, representing various time of ignition.
机译:对于使用挥发性易燃溶剂的室内过程,由于意外溶剂溢出而可能引起爆炸的可能性令人担忧。我们之前开发了一个模型,该模型可从溶剂泄漏预测时间相关的平均浓度,从而说明可调节的房间通风速率和新鲜空气补充比例。当前的论文报道扩展了室内泄漏模型,以处理垂直浓度曲线和部分体积爆燃超压。垂直浓度分布出现在较低的分层区域中,有大量蒸气。在该区域上方将出现一个充分混合的区域,在其上方出现一个贫油或无燃料的区域。通过这种扩展,即使房间中的平均浓度低于可燃极限,也可以在分层区域中找到可燃浓度。点燃分层蒸气会引起部分体积爆燃。描述了一种简单的方法来预测爆炸口打开之前由于部分体积爆燃而产生的过压。可以将预测的爆炸超压与时间作图,以表示各种点火时间。

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